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HELP motor speed control using 89C2051

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novschopin

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can anyone here please tell me how to write the full code of 89C2051 to control the speed of the motor? how to write the code for pwm? thanks.
motor forward when p3.4 and p3.5 on, p3.3 and p3.7 off.
motor reverse when p3.3 and p3.7 on, p3.4 and p3.5 off.
below is my schematic
 

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